import java.util.Scanner;
 
 class MyDCTester  {

     public static void main (String[] args) {
 
     String expression, again;
 
     int result;
 
     try
     {
       Scanner in = new Scanner(System.in);
 
       do
       {
         MyDC evaluator = new MyDC();
         System.out.println ("Enter a valid postfix expression: ");
         expression = in.nextLine();
 
         result = evaluator.evaluate (expression);
         System.out.println();
         System.out.println ("That expression equals " + result);
 
         System.out.print ("Evaluate another expression [Y/N]? ");
         again = in.nextLine();
         System.out.println();
       }
       while (again.equalsIgnoreCase("y"));
     }
     catch (Exception IOException)
     {
     System.out.println("Input exception reported");
      }
    }
  }

